Research is Colorado’s San Juan Mountains has illustrated that in comparison to stands of lodgepole pine and Englemann spruce, stands of trembling aspen have all of the following EXCEPT
a. higher soil temperatures.
b. more soil nitrate.
c. different arrays of soil-dwelling organisms.
d. light reaching the soil surface.
e. more soil phosphorus.
E
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How many carbon dioxide molecules are released on each turn of the citric acid cycle?
a. Two b. Eight c. Four d. Three
What results when nitrogen dioxide and hydrocarbons react in the presence of sunlight?
a. photochemical smog b. industrial smog c. a thermal inversion d. acid rain e. particulate fallout
Dragonflies that ranged in size from those smaller than today's dragonflies to some with wingspans of
75 centimeters (2.5 feet) appeared during the:a. Cambrian period. b. Ordovician period. c. Silurian period. d. Devonian period. e. Carboniferous period.
When the acidic level of human blood increases, how is the proper balance of hydrogen ions (H+) restored?
A) Bicarbonate (HCO3-) releases H+ ions that combine with excess OH- ions to form H2O. B) Carbonic acid eats up the extra OH- ions. C) Bicarbonate (HCO3-) accepts H+ ions and forms carbonic acid. D) H+ ion-donor levels increase.